Epitaxial Rotation and Rotational Phase Transitions
When one crystalline material grows on another, the high-symmetry directions of the adsorbate usually align with high symmetry directions of the substrate. In some cases, though,the adsorbate undergoes an epitaxial rotation: the high symmetry directions of the adsorbate are rotated some apparently arbitrary angle with respect to those of the substrate. We discuss several experimental examples of this phenomenon, and review briefly the theoretical efforts to understand and predict epitaxial rotation. We argue that a simple symmetry principle seems to underly the theoretical results, and that it explains many otherwise curious experimental observations. The principle leads in a straightforward way to the consideration of several types of rotational phase transition, which we discuss qualitatively.
KeywordsDomain Wall Rotation Angle Interface Energy Reciprocal Space Coincidence Site Lattice
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